Cinematograph apparatus



Aug. 27, 1957 A. R. KUHNERT 2,

CINEMATOGRAPH APPARATUS Filed Sept. 26, 1955 IN VENTOR A. R L/UH/VER 7' ATTORNE r5 United States Patent "ice CINEMATOGRAPH APPARATUS Alfred Rudolf Kuhnert, Dresden, Germany, assignor to VEB Zeiss Ikon Dresden, Dresden, Germany Application September 26, 1955, Serial No. 536,606

Claims priority, application Germany November 5, 1954 1 Claim. (Cl. 179100.1)

The invention relates to a sound film reproduction apparatus with which films with photographed sound and magnetic sound films can be optionally scanned.

For the conservation of the film, and of the magnet head it is necessary in such combined scanning apparatus to lift the magnet head from the film during the scanning of the photographed sound.

Arrangements for magnetic sound apparatus have already been proposed in which the lifting of a magnet head for the purpose of the easier insertion of the film and the lifting takes place by means of an electro-magnet when operating the main switch of the magnetic sound apparatus. As compared with this arrangement the problem to be solved by the present invention of lifting the magnet head automatically from the sound carrier when changing over from magnetic sound scanning to scanning of photographed sound in a combined apparatus for scanning photographed sound and magnetic sound.

This problem is solved according to the invention by the fact that when scanning of a film with photographed sound the magnet head is lifted from the film by an elec tro-magnet, the coil of which is connected in parallel to the exciter lamp.

By means of the arrangement according ,to the invention the possibility is prevented of forgetting to move aside the magnet head when changing over from scanning magnetic sound to scanning of photographed sound owing to the carelessness of the operating staff; the lift- 2,804,505 Patented Aug. 27, 1957 ing takes place positively with the closing of the current circuit of the exciter lamp.

A further important advantage of the arrangement consists in the fact that the current flows through the magnet coil only during the scanning of the photographed sound, whereas it is currentless during magnetic sound scanning, so that no kind of inductive influencing of the magnet head by the coil of the magnet head can occur during the magnetic sound scanning.

A further advantage can be seen in the fact that the already present current source for the exitation of the exciter lamp can be used for the control of the electromagnet.

One example of embodiment of the invention is shown in the drawing.

The scanning point 3 for the magnetic sound and the scanning point 4 for the photographic sound are situated on the sound drum 1, over which the film band 2 runs. The magnet head 5 is fixed on a lever 6, which is swingably mounted at 7. There is located parallel in with the exciter lamp 8 the coil 9 of an electro-magnet, the armature 10 of which is connected with a lever 11. As soon as the exciter lamp switch 12 is closed, the coil 9 of the electro-magnet receives current and attracts the armature 10, so that through the lever 11 the lever 6 connected with the magnet head is swing clockwise.

I claim:

In a sound film reproduction apparatus for the use of films having a photographic sound track or a magnetic sound track as desired, comprising an exciter lamp for scanning the photographic sound track, a magnetic head pivotally mounted so as to move towards and away from the film for scanning the magnetic sound track, an electro-magnetic arrangement consisting of a magnetic coil connected in parallel with the exciter lamp, and means operatively connected to the magnetic head, said means being operatively associated with said coil andinfluenced by the magnetic field produced by the exciter lamp current flowing through the magnetic coil thereby lifting the pivotally mounted magnetic head from the film in the scanning of the photographic sound track.

No references cited. 

